Comparative Performance Analysis of Machine Learning Techniques for Software Bug Detection

David C. Wyld et al. (Eds) : ITCS, CST, JSE, SIP, ARIA, DMS - 2015
pp. 71–79, 2015. © CS & IT-CSCP 2015 DOI : 10.5121/csit.2015.50108
COMPARATIVE PERFORMANCE ANALYSIS
OF MACHINE LEARNING TECHNIQUES
FOR SOFTWARE BUG DETECTION
Saiqa Aleem1
, Luiz Fernando Capretz1
and Faheem Ahmed2
1
Western University, Department of Electrical & Computer Engineering,
London,Ontario, Canada, N6A5B9
{saleem4, lcapretz}@uwo.ca
2
Thompson Rivers University, Department of Computing Science,
Kamloops, British Columbia, Canada, V2C 6N6
fahmed@tru.ca
ABSTRACT
Machine learning techniques can be used to analyse data from different perspectives and enable
developers to retrieve useful information. Machine learning techniques are proven to be useful
in terms of software bug prediction. In this paper, a comparative performance analysis of
different machine learning techniques is explored for software bug prediction on public
available data sets. Results showed most of the machine learning methods performed well on
software bug datasets.
KEYWORDS
Machine Learning Methods, Software Bug Detection, Predictive Analytics.
1. INTRODUCTION
The advancement in software technology causes an increase in the number of software products,
and their maintenance has become a challenging task. More than half of the life cycle cost for a
software system includes maintenance activities. With the increase in complexity in software
systems, the probability of having defective modules in the software systems is getting higher. It
is imperative to predict and fix the defects before it is delivered to customers because the software
quality assurance is a time consuming task and sometimes does not allow for complete testing of
the entire system due to budget issue. Therefore, identification of a defective software module can
help us in allocating limited time and resources effectively. A defect in a software system can also
be named a bug.
A bug indicates the unexpected behaviour of system for some given requirements. The
unexpected behaviour is identified during software testing and marked as a bug. A software bug
can be referred to as” Imperfection in software development process that would cause software to
fail to meet the desired expectation” [1]. Moreover, the finding of defects and correcting those
results in expensive software development activities [2]. It has been observed that a small number
of modules contain the majority of the software bugs [3, 4]. Thus, timely identification of
software bugs facilitates the testing resources allocation in an efficient manner and enables

72 Computer Science & Information Technology (CS & IT)
developers to improve the architectural design of a system by identifying the high risk segments
of the system [5, 6, 7].
Machine learning techniques can be used to analyse data from different perspectives and enable
developers to retrieve useful information. The machine learning techniques that can be used to
detect bugs in software datasets can be classification and clustering. Classification is a data
mining and machine learning approach, useful in software bug prediction. It involves
categorization of software modules into defective or non-defective that is denoted by a set of
software complexity metrics by utilizing a classification model that is derived from earlier
development projects data [8]. The metrics for software complexity may consist of code size [9],
McCabe’s cyclomatic complexity [10] and Halstead’s Complexity [11].
Clustering is a kind of non-hierarchal method that moves data points among a set of clusters until
similar item clusters are formed or a desired set is acquired. Clustering methods make
assumptions about the data set. If that assumption holds, then it results into a good cluster. But it
is a trivial task to satisfy all assumptions. The combination of different clustering methods and by
varying input parameters may be beneficial. Association rule mining is used for discovering
frequent patterns of different attributes in a dataset. The associative classification most of the
times provides a higher classification as compared to other classification methods.
This paper explores the different machine learning techniques for software bug detection and
provides a comparative performance analysis between them. The rest of the paper is organized as
follows: Section II provides a related work on the selected research topic; Section III discusses
the different selected machine learning techniques, data pre-process and prediction accuracy
indicators, experiment procedure and results; Section VI provides the discussion about
comparative analysis of different methods; and Section V concludes the research.
2. RELATED WORK
Lessmann et al. [12] proposed a novel framework for software defect prediction by benchmarking
classification algorithms on different datasets and observed that their selected classification
methods provide good prediction accuracy and supports the metrics based classification. The
results of the experiments showed that there is no significant difference in the performance of
different classification algorithms. The study did not cover all machine learning techniques for
software bug prediction. Sharma and Jain [13] explored the WEKA approach for different
classification algorithms but they did not explore them for software bug prediction. Kaur and
Pallavi [14] explored the different data mining techniques for software bug prediction but did not
provide the comparative performance analysis of techniques. Wang et al. [15] provided a
comparative study of only ensemble classifiers for software bug prediction. Most of the existed
studies on software defect prediction are limited in performing comparative analysis of all the
methods of machine learning. Some of them used few methods and provides the comparison
between them and others just discussed or proposed a method based on existing machine learning
techniques by extending them [16, 17, 18].
3. MACHINE LEARNING TECHNIQUES FOR SOFTWARE BUG
DETECTION
In this paper, a comparative performance analysis of different machine learning techniques is
explored for software bug prediction on public available data sets. Machine learning techniques
are proven to be useful in terms of software bug prediction. The data from software repository
contains lots of information in assessing software quality; and machine learning techniques can be
applied on them in order to extract software bugs information. The machine learning techniques

Computer Science & Information Technology (CS & IT) 73
are classified into two broad categories in order to compare their performance; such as supervised
learning versus unsupervised learning. In supervised learning algorithms such as ensemble
classifier like bagging and boosting, Multilayer perceptron, Naive Bayes classifier, Support
vector machine, Random Forest and Decision Trees are compared. In case of unsupervised
learning methods like Radial base network function, clustering techniques such as K-means
algorithm, K nearest neighbour are compared against each other.
3.1 Datasets & Pre-processing
The datasets from PROMISE data repository [20] were used in the experiments. Table 1 shows
the information about datasets. The datasets were collected from real software projects by NASA
and have many software modules. We used public domain datasets in the experiments as this is a
benchmarking procedure of defect prediction research, making easier for other researcher to
compare their techniques [12, 7]. Datasets used different programming languages and code
metrics such as Halstead’s complexity, code size and McCabe’s cyclomatic complexity etc.
Experiments were performed by such a baseline.
Waikato Environment for Knowledge Analysis (WEKA) [20] tool was used for experiments. It is
an open source software consisting of a collection of machine learning algorithms in java for
different machine learning tasks. The algorithms are applied directly to different datasets. Pre-
processing of datasets has been performed before using them in the experiments. Missing values
were replaced by the attribute values such as means of attributes because datasets only contain
numeric values. The attributes were also discretized by using filter of Discretize (10-bin
discretization) in WEKA software. The data file normally used by WEKA is in ARFF file format,
which consists of special tags to indicate different elements in the data file (foremost: attribute
names, attribute types, and attribute values and the data).
3.2 Performance indicators
For comparative study, performance indicators such as accuracy, mean absolute error and F-
measure based on precision and recall were used. Accuracy can be defined as the total number of
correctly identified bugs divided by the total number of bugs, and is calculated by the equations
listed below:
Accuracy = (TP + TN) / (TP+TN+FP+FN)
Accuracy (%) = (correctly classified software bugs/ Total software bugs) * 100
Precision is a measure of correctness and it is a ratio between correctly classified software bugs
and actual number of software bugs assigned to their category. It is calculated by the equation
below:
Precision = TP /(TP+FP)
Table 1. Datasets Information
CM1 JM1 KC1 KC2 KC3 MC1 MC2 MW1 PC1 PC2 PC3 PC4 PC5 AR1 AR6
Language C C C++ C++ Java C++ C C C C C C C++ C C
LOC 20k 315k 43k 18k 18k 63k 6k 8k 40k 26k 40k 36k 164k 29k 29
Modules 505 10878 2107 522 458 9466 161 403 1107 5589 1563 1458 17186 121 101
Defects 48 2102 325 105 43 68 52 31 76 23 160 178 516 9 15

Table 2. Performance of different machine learning methods with cross validation test mode based on
Accuracy
Supervised learning Unsupervised learning
Datasets
Naye
Bayes
MLP SVM
Ada
Boost
Bagging
Decision
Trees
Random
Forest
J48 KNN RBF K-means
AR1 83.45 89.55 91.97 90.24 92.23 89.32 90.56 90.15 65.92 90.33 90.02
AR6 84.25 84.53 86.00 82.70 85.18 82.88 85.39 83.21 75.13 85.38 83.65
CM1 84.90 89.12 90.52 90.33 89.96 89.22 89.40 88.71 84.24 89.70 86.58
JM1 81.43 89.97 81.73 81.70 82.17 81.78 82.09 80.19 66.89 81.61 77.37
KC1 82.10 85.51 84.47 84.34 85.39 84.88 85.39 84.13 82.06 84.99 84.03
KC2 84.78 83.64 82.30 81.46 83.06 82.65 82.56 81.29 79.03 83.63 80.99
KC3 86.17 90.04 90.80 90.06 89.91 90.83 89.65 89.74 60.59 89.87 87.91
MC1 94.57 99.40 99.26 99.27 99.42 99.27 99.48 99.37 68.58 99.27 99.48
MC2 72.53 67.97 72.00 69.46 71.54 67.21 70.50 69.75 64.49 69.51 69.00
MW1 83.63 91.09 92.19 91.27 92.06 90.97 91.29 91.42 81.77 91.99 87.90
PC1 88.07 93.09 93.09 93.14 93.79 93.36 93.54 93.53 88.22 93.13 92.07
PC2 96.96 99.52 99.59 99.58 99.58 99.58 99.55 99.57 75.25 99.58 99.21
PC3 46.87 87.55 89.83 89.70 89.38 89.60 89.55 88.14 64.07 89.76 87.22
PC4 85.51 89.11 88.45 88.86 89.53 88.53 89.69 88.36 56.88 87.27 86.72
PC5 96.93 97.03 97.23 96.84 97.59 97.01 97.58 97.40 66.77 97.15 97.33
Mean 83.47 89.14 89.29 88.59 89.386 88.47 89.08 88.33 71.99 88.87 87.29
Recall is a ratio between correctly classified software bugs and software bugs belonging to their
category. It represents the machine learning method’s ability of searching extension and is
calculated by the following equation.
Recall = TP / (TP + FN)
F-measure is a combined measure of recall and precision, and is calculated by using the following
equation. The higher value of F-measure indicates the quality of machine learning method for
correct prediction.
F = (2 * precision * recall ) / (Precision + recall)
3.3 Experiment Procedure & Results
For comparative performance analysis of different machine learning methods, we selected 15
software bug datasets and applied machine learning methods such as NaiveBayes, MLP, SVM,
AdaBoost, Bagging, Decision Tree, Random Forest, J48, KNN, RBF and K-means. We employed
WEKA tool for the implementation of experiments. The 10- fold cross validation test mode was
selected for the experiments.
Table 3. Performance of different machine learning methods with cross validation test mode based on mean
absolute error
Datasets
NayeB
ayes
ML
P
SVM AdaBoost Bagging
Decision
Trees
Random
Forest
J48 KNN RBF
K-
means
AR1 0.17 0.11 0.08 0.12 0.13 0.12 0.13 0.13 0.32 0.13 0.11
AR6 0.17 0.19 0.13 0.22 0.24 0.25 0.22 0.23 0.25 0.22 0.17
CM1 0.16 0.16 0.10 0.16 0.16 0.20 0.16 0.17 0.16 0.17 0.14
JM1 0.19 0.27 0.18 0.27 0.25 0.35 0.25 0.26 0.33 0.28 0.23

KC1 0.18 0.21 0.15 0.22 0.20 0.29 0.19 0.20 0.18 0.23 0.17
KC2 0.16 0.22 0.17 0.22 0.22 0.29 0.22 0.23 0.21 0.23 0.21
KC3 0.15 0.12 0.09 0.14 0.14 0.17 0.14 0.13 0.39 0.15 0.12
MC1 0.06 0.01 0.01 0.01 0.01 0.03 0.01 0.01 0.31 0.01 0.01
MC2 0.27 0.32 0.28 0.39 0.37 0.40 0.35 0.32 0.35 0.41 0.31
MW1 0.16 0.11 0.08 0.12 0.12 0.15 0.12 0.12 0.18 0.12 0.13
PC1 0.11 0.11 0.07 0.11 0.10 0.14 0.09 0.10 0.12 0.12 0.08
PC2 0.03 0.01 0.00 0.01 0.01 0.02 0.01 0.01 0.18 0.01 0.01
PC3 0.51 0.14 0.10 0.16 0.15 0.21 0.15 0.15 0.36 0.18 0.13
PC4 0.14 0.12 0.11 0.15 0.14 0.16 0.14 0.12 0.43 0.20 0.13
PC5 0.04 0.03 0.03 0.04 0.03 0.06 0.03 0.03 0.33 0.05 0.03
Mean 0.16 0.14 0.10 0.15 0.15 0.18 0.14 0.14 0.27 0.16 0.13
Table 4. Performance of different machine learning methods with cross validation test mode based
on F-measure
Datas
ets
NayeBay
es
MLP SVM
AdaBoo
st
Bagging
Decision
Trees
Random
Forest
J48 KNN RBF
K-
means
AR1 0.90 0.94 0.96 0.95 0.96 0.94 0.96 0.95 0.79 0.95 0.94
AR6 0.90 0.91 0.93 0.90 0.92 0.90 0.92 0.90 0.84 0.92 0.90
CM1 0.91 0.94 0.95 0.95 0.95 0.94 0.94 0.94 0.91 0.95 0.93
JM1 0.89 0.90 0.90 0.90 0.90 0.90 0.90 0.88 0.80 0.90 0.86
KC1 0.90 0.92 0.92 0.91 0.92 0.92 0.92 0.91 0.89 0.92 0.91
KC2 0.90 0.90 0.90 0.88 0.90 0.89 0.89 0.88 0.86 0.90 0.88
KC3 0.91 0.94 0.95 0.95 0.95 0.95 0.94 0.94 0.72 0.95 0.93
MC1 0.97 1.00 1.00 1.00 1.00 1.00 1.00 1.00 0.81 1.00 1.00
MC2 0.82 0.78 0.82 0.80 0.81 0.77 0.80 0.78 0.76 0.81 0.77
MW1 0.90 0.95 0.96 0.95 0.96 0.95 0.95 0.95 0.89 0.96 0.93
PC1 0.94 0.97 0.96 0.96 0.97 0.97 0.97 0.97 0.94 0.96 0.96
PC2 0.99 1.00 1.00 1.00 1.00 1.00 1.00 1.00 0.90 1.00 1.00
PC3 0.60 0.94 0.95 0.95 0.94 0.95 0.94 0.94 0.77 0.95 0.93
PC4 0.92 0.94 0.94 0.94 0.94 0.93 0.94 0.93 0.72 0.93 0.92
PC5 0.98 0.99 0.99 0.98 0.99 0.98 0.99 0.99 0.80 0.99 0.99
Mean 0.89 0.93 0.942 0.93 0.94 0.93 0.93 0.93 0.82 0.93 0.92
i) The software bug repository datasets:
D= {AR1, AR6, CM1, JM1, KC1, KC2, KC3, MC1, MC2, MW1, PC1, PC2, PC3, PC4, PC5}
ii) Selected machine learning methods
M = {Nayes Bayes, MLP, SVM, AdaBoost, Bagging, Decision Tree, Random Forest, J48, KNN,
RBF, K-means}
Data pre-process:
a) Apply Replace missing values to D
b) Apply Discretize to D
Test Model - cross validation (10 folds):
for each D do for each M do
Perform cross-validation using 10-folds
end for
Select accuracy
Select Mean Absolute Error (MAE) Select F-measure end for
Experiment procedure:
Input:

Output:
a) Accuracy
b) Mean Absolute Error
c) F-measure
3.4 Experiment results
Table 2, 3 & 4 show the results of the experiment. Three parameters were selected in order to
compare them such as Accuracy, Mean absolute error and F-measure. In order to compare the
selected algorithms the mean was taken for all datasets and the results are shown in Figure 1, 2 &
3.
Figure 1. Accuracy results for selected machine learning methods
Figure 2. MAE results for selected machine learning methods

Figure 3. F-measure results for selected machine learning methods
4. DISCUSSION & CONCLUSION
Accuracy, F-measure and MAE results are gathered on various datasets for different algorithms
as shown in Table 2, 3 & 4. The following observations were drawn from these experiment
results:
NaiveBayes classifier for software bug classification showed a mean accuracy of various datasets
83.47. It performed really well on datasets MC1, PC2 and PC5, where the accuracy results were
above 95%. The worst performance can be seen on dataset PC3, where the accuracy was less than
50%. MLP also performed well on MC1 and PC2 and got overall accuracy on various datasets
89.14 %. SVM and Bagging performed really well as compared to other machine learning
methods, and got overall accuracy of around 89 %. Adaboost got accuracy of 88.59, Bagging got
89.386, Decision trees achieved accuracy around 88.47, Random Forest got 89.08, J48 got 88.33
and in the case of unsupervised learning KNN achieved 71.99, RBF achieved 88.87 and K-means
achieved 87.29. MLP, SVM and Bagging performance on all the selected datasets was good as
compared to other machine learning methods. The lowest accuracy was achieved by KNN
method.
The best MAE achieved by SVM method which is 0.10 on various datasets and got 0.00 MAE for
PC2 dataset. The worst MAE was for KNN method which was 0.27. K-means, MLP, Random
Forest and J48 also got better MAE around 0.14. In the case of F-measure, higher is better.
Higher F-measure was achieved by SVM and Bagging methods which were around 0.94. The
worst F-measure as achieved by KNN method which was 0.82 on various datasets.
Software bugs identification at an earlier stage of software lifecycle helps in directing software
quality assurance measures and also improves the management process of software. Effective
bug’s prediction is totally dependent on a good prediction model. This study covered the different
machine learning methods that can be used for a bug’s prediction. The performance of different
algorithms on various software datasets was analysed. Mostly SVM, MLP and bagging
techniques performed well on bug’s datasets. In order to select the appropriate method for bug’s
prediction domain experts have to consider various factors such as the type of datasets, problem
domain, uncertainty in datasets or the nature of project. Multiple techniques can be combined in
order to get more accurate results.

ACKNOWLEDGEMENT
The authors would like to thank Dr. Jagath Samarabandu for his constructive comments
which contributed to the improvement of this article as his course work.
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AUTHORS
Saiqa Aleem received her MS in Computer Science (2004) from University of Central
Punjab, Pakistan and MS in Information Technology (2013) from UAEU, United Arab
Emirates. Currently, she is pursuing her PhD. in software engineering from University
of Western Ontario, Canada. She had many years of academic and industrial
experience holding various technical positions. She is Microsoft, CompTIA, and
CISCO certified professional with MCSE, MCDBA, A+ and CCNA certifications.
Dr. Luiz Fernando Capretz has vast experience in the software engineering field as
practitioner, manager and educator. Before joining the University of Western Ontario
(Canada), he worked at both technical and managerial levels, taught and did research
on the engineering of software in Brazil, Argentina, England, Japan and the United
Arab Emirates since 1981. He is currently a professor of Software Engineering and
Assistant Dean (IT and e-Learning), and former Director of the Software Engineering
Program at Western. He was the Director of Informatics and Coordinator of the
computer science program in two universities in Brazil. He has published over 200
academic papers on software engineering in leading international journals and conference proceedings, and
co-authored two books: Object-Oriented Software: Design an Maintenance published by World Scientific,
and Software Product Lines published by VDM-Verlag. His current research interests are software
engineering, human aspects of software engineering, software analytics, and software engineering
education. Dr. Capretz received his Ph.D. from the University of Newcastle upon Tyne (U.K.), M.Sc. from
the National Institute for Space Research (INPE-Brazil), and B.Sc. from UNICAMP (Brazil). He is a senior
member of IEEE, a distinguished member of the ACM, a MBTI Certified Practitioner, and a Certified
Professional Engineer in Canada (P.Eng.). He can be contacted at lcapretz@uwo.ca; further information
can be found at: http://www.eng.uwo.ca/people/lcapretz/
Dr. Faheem Ahmed received his MS (2004) and Ph.D. (2006) in Software
Engineering from the Western University, London, Canada. Currently he is Associate
Professor and Chair at Thompson Rivers University, Canada. Ahmed had many years
of industrial experience holding various technical positions in software development
organizations. During his professional career he has been actively involved in the life
cycle of software development process including requirements management, system
analysis and design, software development, testing, delivery and maintenance. Ahmed
has authored and co-authored many peer-reviewed research articles in leading journals
and conference proceedings in the area of software engineering. He is a senior member of IEEE.

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